[jira] [Created] (HBASE-7386) Investigate providing some supervisor support for znode deletion

["Gregory Chanan (JIRA)" <ji...@apache.org>]

Gregory Chanan created HBASE-7386:
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             Summary: Investigate providing some supervisor support for znode deletion
                 Key: HBASE-7386
                 URL: https://issues.apache.org/jira/browse/HBASE-7386
             Project: HBase
          Issue Type: Task
          Components: master, regionserver, scripts
            Reporter: Gregory Chanan
            Assignee: Gregory Chanan
             Fix For: 0.96.0


There a couple of JIRAs for deleting the znode on a process failure:
HBASE-5844 (RS)
HBASE-5926 (Master)
which are pretty neat; on process failure, they delete the znode of the underlying process so HBase can recover faster.

These JIRAs were implemented via the startup scripts; i.e. the script hangs around and waits for the process to exit, then deletes the znode.

There are a few problems associated with this approach, as listed in the below JIRAs:
1) Hides startup output in script
https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463401&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463401
2) two hbase processes listed per launched daemon
https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463409&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463409
3) Not run by a real supervisor
https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463409&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463409
4) Weird output after kill -9 actual process in standalone mode
https://issues.apache.org/jira/browse/HBASE-5926?focusedCommentId=13506801&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13506801
5) Can kill existing RS if called again
https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13463401&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13463401
6) Hides stdout/stderr[6]
https://issues.apache.org/jira/browse/HBASE-5844?focusedCommentId=13506832&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13506832

I suspect running in via something like supervisor.d can solve these issues if we provide the right support.

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